US20080026652A1 - Marine reduction and reverse gear unit - Google Patents
Marine reduction and reverse gear unit Download PDFInfo
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- US20080026652A1 US20080026652A1 US11/878,322 US87832207A US2008026652A1 US 20080026652 A1 US20080026652 A1 US 20080026652A1 US 87832207 A US87832207 A US 87832207A US 2008026652 A1 US2008026652 A1 US 2008026652A1
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- gear
- forward speed
- reverse
- hydraulic clutch
- hydraulic
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- 230000002441 reversible effect Effects 0.000 title claims abstract description 103
- 230000009467 reduction Effects 0.000 title claims abstract description 56
- 230000001154 acute effect Effects 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 29
- 239000010720 hydraulic oil Substances 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/02—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing
- B63H23/08—Transmitting power from propulsion power plant to propulsive elements with mechanical gearing with provision for reversing drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H23/00—Transmitting power from propulsion power plant to propulsive elements
- B63H23/30—Transmitting power from propulsion power plant to propulsive elements characterised by use of clutches
Definitions
- the present invention relates to a marine reduction and reverse gear unit, and particularly to a marine reduction and reverse gear unit suitable for wakeboats.
- V-drive reduction and reverse gear units which have an output shaft disposed at an acute angle with respect to an input shaft from an engine, are known (for example, Japanese Unexamined Patent Publication No. 2006-117160, Japanese Examined Patent Publication No. 1994-65904, Japanese Utility Model Publication No. 1994-40560, and U.S. Pat. No. 4,383,829).
- Angle-drive” reduction and reverse gear units which have an output shaft disposed at an obtuse angle with respect to an input shaft, are also known (for example, FIG. 4 of Japanese Examined Patent Publication No. 1994-65904, and U.S. Pat. No. 6,443,286).
- V-drive reduction and reverse gear units the engine is mounted approximately horizontally on the aft side of the reduction and reverse gear unit. By disposing the entire drive system in one place toward the stern to save space, inboard space can be increased. In angle-drive reduction and reverse gear units, the engine is disposed slightly toward the center from the stern, but is mounted horizontally near the bottom of the boat, whereby inboard space can be increased. Therefore, both types of reduction and reverse gear units are widely used for middle and small marine vessels, such as pleasure boats.
- Pleasure boats provided with such reduction and reverse gear units include motorboats called “wakeboats” designed especially for wakeboarding.
- Wakeboats usually have a speed range of 0 to 45 mph (miles per hour). When used for wakeboarding, wakeboats run at about 20 mph with added ballast water, while intentionally creating a wake.
- the present invention provides a marine reduction and reverse gear unit which increases the number of engine revolutions when wakeboarding to thereby provide a stable boat speed and enhanced acceleration performance.
- a first embodiment of a marine reduction and reverse gear unit which has an output shaft disposed at an acute or obtuse angle with respect to an input shaft, comprises: a drive gear for transmitting torque from the input shaft; first and second driven gears engaged with the drive gear and disposed on the right and left sides of the drive gear to sandwich the drive gear therebetween; a reverse gear connected to the drive gear via a reverse hydraulic clutch; a first forward speed gear connected to the first driven gear via a first forward speed hydraulic clutch; a second forward speed gear connected to the second driven gear via a second forward speed hydraulic clutch; and an output gear fixed on the output shaft and engaged directly with any one of the reverse gear, first forward speed gear and second forward speed gear or engaged therewith via idle gears to thereby receive the transmitted torque.
- the first embodiment is modified so that the drive gear is fixed on the input shaft; the reverse gear is rotatably supported by the input shaft; the first driven gear and the first forward speed gear are supported by a first support shaft, and the second driven gear and the second forward speed gear are supported by a second support shaft.
- the first embodiment is modified so that the input shaft has a bevel gear fixed thereon; the drive gear or a gear for transmitting torque to the drive gear is engaged with the bevel gear to transmit torque from the input shaft to the drive gear; the drive gear and the reverse gear are supported by a third shaft; the first driven gear and the first forward speed gear are supported by a first support shaft; and the second driven gear and the second forward speed gear are supported by a second support shaft.
- one of the first to third embodiments is modified so that the marine reduction and reverse gear unit further comprises a hydraulic circuit for controlling the hydraulic pressure of the reverse hydraulic clutch, first forward speed hydraulic clutch, and second forward speed hydraulic clutch;
- the hydraulic circuit comprises a shift control valve for switching oil passages to supply hydraulic oil to the first forward speed hydraulic clutch or to the second forward speed hydraulic clutch;
- the shift control valve is a pilot-operated spring-return directional control valve using the primary hydraulic pressure as pilot pressure and configured to switch from an oil passage for supplying hydraulic oil to the second forward speed hydraulic clutch to an oil passage for supplying hydraulic oil to the first forward speed hydraulic clutch, based on the increase of hydraulic pressure.
- the fourth embodiment is modified so that the shift control valve is a 3-position directional control valve configured in such a manner when the valve is in the center position, the secondary port communicates with both of the oil passages for supplying hydraulic oil to the first forward speed hydraulic clutch and the second forward speed hydraulic clutch.
- the fourth and fifth embodiment is modified so that the pilot oil passage of the shift control valve is provided with a variable throttle or a variable flow-control valve.
- one of the fourth to sixth embodiments is modified so that the return spring of the shift control valve is provided with a spring force adjustment mechanism.
- the marine reduction and reverse gear unit according to the present invention is configured to shift the hydraulic clutches to transmit torque from the input shaft to the output shaft via one of the reverse gear, first forward speed gear, and second forward speed gear. Therefore, when wakeboarding, a first forward speed hydraulic clutch for a first forward speed gear for high reduction ratios is engaged to increase the number of engine revolutions, whereby a stable boat speed and enhanced acceleration performance can be provided.
- FIG. 1 is a longitudinal sectional view illustrating a first embodiment of a marine reduction and reverse gear unit according to the present invention.
- FIG. 2 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit of FIG. 1 .
- FIG. 3 is a sectional view taken along the line III-III of FIG. 2 .
- FIG. 4 is a diagram of a first embodiment of a hydraulic circuit provided in the marine reduction and reverse gear of FIG. 1 .
- FIG. 5 is a diagram of a second embodiment of a hydraulic circuit that is a modification of the hydraulic circuit of FIG. 4 .
- FIG. 6 is a diagram of a third embodiment of a hydraulic circuit that is a modification of the hydraulic circuit of FIG. 5 .
- FIG. 7 is a graph showing output characteristics of a marine reduction and reverse gear unit provided with the hydraulic circuit shown in FIG. 6 .
- FIG. 8 is a longitudinal sectional view illustrating a second embodiment of a marine reduction and reverse gear unit according to the present invention.
- FIG. 9 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit of FIG. 8 .
- FIG. 10 is a longitudinal sectional view schematically illustrating a third embodiment of a marine reduction and reverse gear unit according to the present invention.
- FIG. 11 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit of FIG. 10 .
- FIG. 12 is a sectional view taken along the line XII-XII of FIG. 11 .
- FIG. 13 is a longitudinal sectional view schematically illustrating a fourth embodiment of a marine reduction and reverse gear unit according to the present invention.
- FIG. 14 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit of FIG. 13 .
- FIG. 15 is a sectional view taken along the line XII-XII of FIG. 14 .
- FIG. 1 is a longitudinal sectional view illustrating the marine reduction and reverse gear unit.
- FIG. 2 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit.
- FIG. 3 is a sectional view taken along the line III-III of FIG. 2 .
- FIG. 4 is a diagram of a hydraulic circuit provided in the marine reduction and reverse gear unit.
- the marine reduction and reverse gear unit 1 is provided with a casing 2 .
- the casing 2 is fixed on a housing 5 in which components such as a flywheel 4 connected to a rotary shaft 3 of an engine E ( FIG. 4 ) are accommodated.
- the flywheel 4 is connected to one end of an input shaft 7 via an elastic coupling 6 .
- the input shaft 7 is rotatably supported by bearings 8 , 9 in the casing 2 .
- a cover 5 A of the housing 5 may be integrally formed with the casing 2 .
- a drive gear 15 is fixed on the input shaft 7 , and a reverse gear 16 is rotatably supported by the input shaft 7 .
- a reverse hydraulic clutch 17 for connecting the drive gear 15 and reverse gear 16 is also disposed on the input shaft 7 and located between the drive gear 15 and reverse gear 16 .
- the reverse hydraulic clutch 17 is a known wet multiplate clutch.
- a plurality of clutch discs are fixed on an inner drum integrally formed with the reverse gear 16 , and each of a plurality of pressure plates fixed on an outer drum integrally formed with the drive gear 15 are inserted into each space between the plurality of the clutch discs. These discs and plates are brought into tight contact with each other by the pressing force of a hydraulic piston to thereby transmit driving force.
- the reverse gear 16 is engaged with a first idle gear 21 fixed on an idle shaft 20 .
- the idle shaft 20 is rotatably supported by a casing 2 .
- a second idle gear 22 is also fixed on the idle shaft 20 and located at a distance from the first idle gear 21 toward the bow of the boat.
- the second idle gear 22 is engaged with an output gear 26 fixed on an output shaft 25 .
- a propeller P ( FIG. 4 ) is fixed on the output shaft 25 .
- the second idle gear 22 and the output gear 26 are in the form of bevel gears.
- the output shaft 25 is disposed at an acute angle with respect to the idle shaft 20
- the idle shaft 20 is disposed parallel to the input shaft 7 .
- the axial direction of the output shaft 25 is at an acute angle with respect to that of the input shaft 7 .
- a first driven gear 30 and a second driven gear 31 are disposed on the right and left sides of the drive gear 15 in such a manner that the drive gear 15 is sandwiched between the first and second driven gears 30 , 31 .
- the first driven gear 30 and the second driven gear 31 are engaged with the drive gear 15 .
- the first driven gear 30 is fixed on a first support shaft 35 .
- the first support shaft 35 is rotatably supported by the casing 2 and disposed parallel to the input shaft 7 .
- a first forward speed gear 33 engaged with a first idle gear 21 is rotatably supported by the first support shaft 35 and disposed at a distance from the first driven gear 30 .
- a first forward speed hydraulic clutch 37 for connecting the first driven gear 30 and first forward speed gear 33 is also disposed on the first support shaft 35 and located between the first driven gear 30 and the first forward speed gear 33 .
- the first forward speed hydraulic clutch 37 is a wet multiplate clutch as used for the reverse hydraulic clutch 17 .
- the second driven gear 31 is fixed on a second support shaft 32 .
- the second support shaft 32 is rotatably supported by the casing 2 and disposed parallel to the input shaft 7 .
- a second forward speed gear 36 engaged with a first idle gear 21 is rotatably supported by the second support shaft 32 and disposed at a distance from the second driven gear 31 .
- a second forward speed hydraulic clutch 34 for connecting the second driven gear 31 and second forward speed gear 36 is also disposed on the second support shaft 32 and located between the second driven gear 31 and the second forward speed gear 36 .
- the second forward speed hydraulic clutch 34 is a wet multiplate clutch as used for the reverse hydraulic clutch 17 .
- the speed reducing ratio provided by the first forward speed gear 33 and the first idle gear 21 is made greater than that provided by the second forward speed gear 36 and the first idle gear 21 .
- the first and second support shafts 35 , 32 constantly rotate with respect to the input shaft 7 via the drive gear 15 , and the first and second driven gears 30 , 31 , respectively.
- a gear pump 10 ( FIG. 3 ) driven by the input shaft 7 is provided at the other end of the second support shaft 32 .
- a hydraulic circuit for supplying hydraulic or lubricating oil to hydraulic clutches, etc. by the gear pump 10 is formed in a hydraulic control block 11 , and the hydraulic control block 11 is mounted on the casing 2 .
- the marine reduction and reverse gear 1 having the above configuration transmits driving force from an engine E (see FIG. 4 ) to an output shaft 25 in the following manner.
- the reverse hydraulic clutch 17 is disengaged and the first forward speed hydraulic clutch 37 is engaged, so that the rotation of the input shaft 7 is transmitted to the output shaft 25 via the drive gear 15 , first driven gear 30 , first forward speed gear 33 , first idle gear 21 , second idle gear 22 , and output gear 26 to achieve a high reduction ratio.
- first forward speed hydraulic clutch 37 By shifting from first forward speed drive to second forward speed drive, the first forward speed hydraulic clutch 37 is disengaged and the second forward speed hydraulic clutch 34 is engaged, so that the rotation of the input shaft 7 is transmitted to the output shaft 25 via the drive gear 15 , second driven gear 31 , second forward speed gear 36 , first idle gear 21 , second idle gear 22 , and output gear 26 to achieve a low reduction ratio, compared with a high reduction ratio achieved with the first forward speed drive.
- a first embodiment of a hydraulic circuit for controlling the reverse hydraulic clutch 17 , first forward speed hydraulic clutch 37 , and second forward speed hydraulic clutch 34 is described below with reference to FIG. 4 .
- a gear pump 10 on a second support shaft 32 is driven by rotation of an input shaft 7 .
- the gear pump 10 draws oil from an oil sump 40 in the casing 2 via an oil filter 41 , and discharges the oil.
- the hydraulic oil discharged from the gear pump 10 is supplied to the reverse hydraulic clutch 17 via a forward/reverse directional control valve 42 or supplied to the first forward speed hydraulic clutch 37 or second forward speed hydraulic clutch 34 via a forward/reverse directional control valve 42 and an electromagnetic shift control valve 46 .
- the forward/reverse directional control valve 42 is a manual 5-port, 3-position directional control valve.
- the forward/reverse directional control valve 42 can be connected to a shift lever 42 a in the vessel by a wire cable (not shown).
- the hydraulic circuit is provided with a relief valve 47 having a soft engagement function to reduce the impact of abrupt engagement by clutches 17 , 34 , and 37 .
- the relief valve 47 comprises a pressure-control spring 48 and a spring bearing 49 in the form of a hydraulic piston, which is capable of compressing the pressure-control spring 48 and disposed in a cylinder (not shown).
- the hydraulic circuit includes a pressure control circuit formed by connecting a throttling passage branched from a forward output port and a reverse output port of the forward/reverse directional control valve 42 to an oil chamber in the spring bearing 49 . When the forward/reverse directional control valve 42 is in the neutral position (as in FIG.
- the spring bearing 49 is in the most retracted position due to a biasing force of the pressure-control spring 48 , so that the relief valve 47 functions as a relief valve having a low set pressure.
- the forward/reverse directional control valve 42 is shifted to forward or reverse, the spring bearing 49 moves to compress the pressure-control spring 48 with a time delay.
- the set pressure of the relief valve 47 gradually increases and the spring bearing 49 reaches a specified stroke, the maximum hydraulic pressure for the clutch is obtained.
- the hydraulic pressure for the clutch is gradually increased.
- the oil passed through the relief valve 47 is cooled with an oil cooler 50 , and then passed through a lubricant oil passage 51 .
- the set pressure of the lubricant oil passage 51 is controlled by a relief valve 52 .
- the boat is run at a normal speed by shifting the forward/reverse switching valve 42 to the forward or reverse position.
- the electromagnetic shift control valve 46 is not excited and is positioned as shown in FIG. 4 to thereby engage the second speed hydraulic clutch 34 .
- Switch 42 b connected to the electromagnetic shift control valve 46 is provided on the grip head of the shift lever 42 a .
- second forward speed is switched to first forward speed.
- the first forward speed hydraulic clutch 37 for high reduction ratios is engaged to increase the number of engine revolutions and make a high torque range available, thereby achieving a stable boat speed and enhanced acceleration performance.
- the electromagnetic shift control valve 46 is shifted to disengage the first forward speed hydraulic clutch 37 and engage the second forward speed hydraulic clutch 34 , thereby reducing the number of engine revolutions and achieving stable economical running.
- the second embodiment of the hydraulic circuit is structurally the same as the above first embodiment except that a pilot-operated spring-return directional control valve, which operates using the primary hydraulic pressure as pilot pressure, is used as the directional control valve 46 a in place of the electromagnetic directional control valve 46 .
- the shift control valve 46 a shown in FIG. 5 is a spring offset valve. When the valve is in the normal position, the valve allows the secondary port to communicate with an oil passage 53 for supplying hydraulic oil to the second forward speed hydraulic clutch 34 for low reduction ratios for normal-speed running, and allows an oil passage 52 for supplying hydraulic oil to the first forward speed hydraulic clutch 37 for high reduction ratios to communicate with a drain.
- the shift control valve 46 a allows the oil passage 52 for supplying hydraulic oil to the second forward speed hydraulic clutch 34 to communicate with a drain, and allows the oil passage 52 for supplying hydraulic oil to the first forward speed hydraulic clutch 37 to communicate with the primary oil passage 56 , thereby disengaging the second forward speed hydraulic clutch 34 and engaging the first forward speed hydraulic clutch 37 .
- the hydraulic circuit according to the second embodiment operates in the above-described manner, the following effects can be achieved.
- wakeboarding where the boat runs at a comparatively low speed with added ballast water to increase the tare weight
- the number of engine revolutions is increased to automatically engage the first forward speed hydraulic clutch 37 and make a high torque range available, thereby providing a stable boat speed and enhanced acceleration performance.
- the number of engine revolutions is reduced to automatically disengage the first forward speed hydraulic clutch 37 and engage the second forward speed hydraulic clutch 34 , thereby achieving stable running.
- the operator is free from the need to perform complicated clutch shift operations, and does not have to be conscious thereof when running the boat.
- the third embodiment of the hydraulic circuit is a modification of the second embodiment of the hydraulic circuit.
- the third embodiment of the hydraulic circuit is the same as the second embodiment in that the shift control valve 46 b is a pilot-operated spring-return 3-position directional control valve using the primary pressure as pilot pressure.
- the shift control valve 46 b shown in FIG. 6 is structurally different from the valve 46 a shown in FIG. 5 in that when the shift control valve is in the center position, the secondary port communicates with both of the oil passages to supply hydraulic oil to the first forward speed hydraulic clutch 37 and the second forward speed hydraulic clutch 34 .
- pilot oil passage 57 of the shift control valve 46 b is provided with a variable throttle valve 58
- return spring 55 of the shift control valve 46 b is provided with a spring force adjustment mechanism 55 a.
- the pilot oil passage 57 is provided with a variable throttle valve 58
- the return spring 55 is provided with a spring force adjustment mechanism 55 a .
- these components are to adjust the timing of shifting between first forward speed and second forward speed, either one of the components may be used. It is also possible to use a variable flow-control valve in place of the variable throttle valve 58 .
- FIGS. 8 and 9 a second embodiment of a marine reduction and reverse gear according to the present invention is described with reference to FIGS. 8 and 9 .
- the marine reduction and reverse gear unit 1 A comprises a bevel gear 60 fixed on an input shaft 7 a supported by a casing 2 a .
- a drive gear 15 a engaged with the bevel gear 60 is fixed on a third support shaft 61 .
- the third support shaft 61 is supported by the casing 2 a and disposed at an acute angle with respect to the axis of the input shaft 7 a .
- a reverse gear 16 a is rotatably supported by the third support shaft 61 and disposed at a distance from the drive gear 15 a toward the bow of the boat.
- a reverse hydraulic clutch 17 a for connecting the drive gear 15 a and reverse gear 16 a is disposed between the drive gear 15 a and reverse gear 16 a .
- the reverse gear 16 a is engaged with an output gear 26 a of an output shaft 25 a .
- the output shaft 25 a is rotatably supported by the casing 2 a and disposed parallel to the third support shaft 61 .
- the direction of the output shaft 25 a is disposed at an acute angle with respect to the input shaft 7 a.
- a first driven gear 30 a and a second driven gear 31 a are disposed on the right and left sides of the driven gear 15 a to sandwich the driven gear 15 a between the first and second driven gears 30 a , 31 a .
- the first driven gear 30 a and the second driven gear 31 a are engaged with the drive gear 15 a.
- the first driven gear 30 a is fixed on a first support shaft 35 a .
- the first support shaft 35 a is rotatably supported by the casing 2 a and disposed parallel to the third support shaft 61 .
- a forward first gear 33 a engaged with an output gear 26 a is rotatably supported by the first support shaft 35 a and disposed at a distance from the first driven gear 30 a toward the bow of the boat.
- a first forward speed hydraulic clutch (not shown) for connecting the first driven gear 30 a and the first forward speed gear 33 a is also disposed on the first support shaft 35 a and located between the first driven gear 30 a and the first forward speed gear 33 a.
- the second driven gear 31 a is fixed on a second support shaft 32 a .
- the second support shaft 32 a is rotatably supported by the casing 2 a and disposed parallel to the third support shaft 61 .
- a second forward speed gear 36 a engaged with an output gear 26 a is rotatably supported by the second support shaft 32 a and disposed at a distance from the second driven gear 31 a .
- a second forward speed hydraulic clutch (not shown) for connecting the second driven gear 31 a and the second forward speed gear 36 a is also disposed on the second support shaft 32 a and located between the second driven gear 31 a and the second forward speed gear 36 a.
- the input shaft of the marine reduction and reverse gear unit according to the second embodiment is shorter than the input shaft according to the first embodiment. This downsizing can provide more space above the casing 2 .
- the hydraulic circuit may be the same as in the first embodiment.
- FIGS. 10 to 12 a third embodiment of a marine reduction and reverse gear unit according to the present invention is described with reference to FIGS. 10 to 12 .
- the first and second embodiments illustrate V-drive marine reduction and reverse gear units.
- the third embodiment illustrates an angle-drive marine reduction and reverse gear unit.
- the third embodiment is a modification of the first embodiment to an angle-drive marine reduction and reverse gear unit in which the idle shaft is omitted from the first embodiment.
- engine revolution is transmitted to an output shaft 25 b via the following components: an elastic coupling 6 ; an input shaft 7 b ; a drive gear 15 b fixed on an input shaft 7 b ; a reverse hydraulic clutch 17 b ; a reverse gear 16 b rotatably supported by the input shaft 7 b ; and an output gear 26 b.
- first forward speed drive engine revolution is transmitted to the output shaft 25 b via the following components: the elastic coupling 6 ; the input shaft 7 b ; the drive gear 15 b fixed on the input shaft 7 b ; a first driven gear 30 b fixed on a first support shaft 35 b and engaged with the driven gear 15 b ; a first forward speed hydraulic clutch 37 b ; a first forward speed gear 33 b ; and the output gear 26 b.
- second forward speed drive engine revolution is transmitted to the output shaft 25 b via the following components: the elastic coupling 6 ; the input shaft 7 b ; the drive gear 15 b fixed on the input shaft 7 b ; a second driven gear 31 b fixed on a second support shaft 32 b and engaged with the driven gear 15 b ; a second forward speed hydraulic clutch 34 b ; a second forward speed gear 36 b ; and the output gear 26 b.
- the fourth embodiment is a modification of the second embodiment to an angle-drive marine reduction and reverse gear unit in which a drive gear 15 c is not directly engaged with a bevel gear 60 fixed on an input shaft 7 c , but another gear 62 mounted side-by-side with the drive gear 15 c on a third support shaft 61 c is engaged with the bevel gear 60 , so that rotation of the input shaft 7 c is transmitted from the gear 62 to the drive gear 15 c via the third support shaft 61 c . More specifically, the gear 62 is integrally connected to the drive gear 15 c.
- engine revolution is transmitted to an output shaft 25 c via the following components: an elastic coupling 6 ; an input shaft 7 c ; a bevel gear 60 ; a gear 62 ; a drive gear 15 c ; a reverse hydraulic clutch 17 c ; a reverse gear 16 c ; and an output gear 26 .
- first forward speed drive engine revolution is transmitted to the output shaft 25 c via the following components: the elastic coupling 6 ; the input shaft 7 c ; the bevel gear 60 ; the gear 62 ; the drive gear 15 c ; a first driven gear 30 c fixed on a first support shaft 35 c ; a first forward speed hydraulic clutch 37 c ; a first forward speed gear 33 c supported by the first support shaft 35 c ; and the output gear 26 c.
- second forward speed drive engine revolution is transmitted to the output shaft 25 c via the following components: the elastic coupling 6 ; the input shaft 7 c ; the bevel gear 60 ; the gear 62 ; the drive gear 15 c ; a second driven gear 31 c fixed on a second support shaft 32 c ; a second forward speed hydraulic clutch 34 c ; a second forward speed gear 36 c supported by the second support shaft 32 c ; and the output gear 26 c.
- the gear 62 may be omitted and the drive gear 15 c may be engaged with the bevel gear 60 as in the second embodiment.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a marine reduction and reverse gear unit, and particularly to a marine reduction and reverse gear unit suitable for wakeboats.
- 2. Description of the Related Art
- “V-drive” reduction and reverse gear units, which have an output shaft disposed at an acute angle with respect to an input shaft from an engine, are known (for example, Japanese Unexamined Patent Publication No. 2006-117160, Japanese Examined Patent Publication No. 1994-65904, Japanese Utility Model Publication No. 1994-40560, and U.S. Pat. No. 4,383,829). “Angle-drive” reduction and reverse gear units, which have an output shaft disposed at an obtuse angle with respect to an input shaft, are also known (for example, FIG. 4 of Japanese Examined Patent Publication No. 1994-65904, and U.S. Pat. No. 6,443,286).
- In V-drive reduction and reverse gear units, the engine is mounted approximately horizontally on the aft side of the reduction and reverse gear unit. By disposing the entire drive system in one place toward the stern to save space, inboard space can be increased. In angle-drive reduction and reverse gear units, the engine is disposed slightly toward the center from the stern, but is mounted horizontally near the bottom of the boat, whereby inboard space can be increased. Therefore, both types of reduction and reverse gear units are widely used for middle and small marine vessels, such as pleasure boats.
- Pleasure boats provided with such reduction and reverse gear units include motorboats called “wakeboats” designed especially for wakeboarding.
- Wakeboats usually have a speed range of 0 to 45 mph (miles per hour). When used for wakeboarding, wakeboats run at about 20 mph with added ballast water, while intentionally creating a wake.
- To achieve a boat speed of 20 mph, even an engine with a maximum speed of 5000 rpm rotates at about 2200 rpm. The number of gasoline engine revolutions to produce maximum torque is usually at least 3600 rpm, and an engine rotating at about 2200 rpm is likely to produce insufficient torque.
- The present invention provides a marine reduction and reverse gear unit which increases the number of engine revolutions when wakeboarding to thereby provide a stable boat speed and enhanced acceleration performance.
- A first embodiment of a marine reduction and reverse gear unit according to the present invention, which has an output shaft disposed at an acute or obtuse angle with respect to an input shaft, comprises: a drive gear for transmitting torque from the input shaft; first and second driven gears engaged with the drive gear and disposed on the right and left sides of the drive gear to sandwich the drive gear therebetween; a reverse gear connected to the drive gear via a reverse hydraulic clutch; a first forward speed gear connected to the first driven gear via a first forward speed hydraulic clutch; a second forward speed gear connected to the second driven gear via a second forward speed hydraulic clutch; and an output gear fixed on the output shaft and engaged directly with any one of the reverse gear, first forward speed gear and second forward speed gear or engaged therewith via idle gears to thereby receive the transmitted torque.
- In a second embodiment, the first embodiment is modified so that the drive gear is fixed on the input shaft; the reverse gear is rotatably supported by the input shaft; the first driven gear and the first forward speed gear are supported by a first support shaft, and the second driven gear and the second forward speed gear are supported by a second support shaft.
- In a third embodiment, the first embodiment is modified so that the input shaft has a bevel gear fixed thereon; the drive gear or a gear for transmitting torque to the drive gear is engaged with the bevel gear to transmit torque from the input shaft to the drive gear; the drive gear and the reverse gear are supported by a third shaft; the first driven gear and the first forward speed gear are supported by a first support shaft; and the second driven gear and the second forward speed gear are supported by a second support shaft.
- In a fourth embodiment, one of the first to third embodiments is modified so that the marine reduction and reverse gear unit further comprises a hydraulic circuit for controlling the hydraulic pressure of the reverse hydraulic clutch, first forward speed hydraulic clutch, and second forward speed hydraulic clutch; the hydraulic circuit comprises a shift control valve for switching oil passages to supply hydraulic oil to the first forward speed hydraulic clutch or to the second forward speed hydraulic clutch; and the shift control valve is a pilot-operated spring-return directional control valve using the primary hydraulic pressure as pilot pressure and configured to switch from an oil passage for supplying hydraulic oil to the second forward speed hydraulic clutch to an oil passage for supplying hydraulic oil to the first forward speed hydraulic clutch, based on the increase of hydraulic pressure.
- In a fifth preferable embodiment, the fourth embodiment is modified so that the shift control valve is a 3-position directional control valve configured in such a manner when the valve is in the center position, the secondary port communicates with both of the oil passages for supplying hydraulic oil to the first forward speed hydraulic clutch and the second forward speed hydraulic clutch.
- In a sixth preferable embodiment, the fourth and fifth embodiment is modified so that the pilot oil passage of the shift control valve is provided with a variable throttle or a variable flow-control valve.
- In a seventh embodiment, one of the fourth to sixth embodiments is modified so that the return spring of the shift control valve is provided with a spring force adjustment mechanism.
- The marine reduction and reverse gear unit according to the present invention is configured to shift the hydraulic clutches to transmit torque from the input shaft to the output shaft via one of the reverse gear, first forward speed gear, and second forward speed gear. Therefore, when wakeboarding, a first forward speed hydraulic clutch for a first forward speed gear for high reduction ratios is engaged to increase the number of engine revolutions, whereby a stable boat speed and enhanced acceleration performance can be provided.
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FIG. 1 is a longitudinal sectional view illustrating a first embodiment of a marine reduction and reverse gear unit according to the present invention. -
FIG. 2 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit ofFIG. 1 . -
FIG. 3 is a sectional view taken along the line III-III ofFIG. 2 . -
FIG. 4 is a diagram of a first embodiment of a hydraulic circuit provided in the marine reduction and reverse gear ofFIG. 1 . -
FIG. 5 is a diagram of a second embodiment of a hydraulic circuit that is a modification of the hydraulic circuit ofFIG. 4 . -
FIG. 6 is a diagram of a third embodiment of a hydraulic circuit that is a modification of the hydraulic circuit ofFIG. 5 . -
FIG. 7 is a graph showing output characteristics of a marine reduction and reverse gear unit provided with the hydraulic circuit shown inFIG. 6 . -
FIG. 8 is a longitudinal sectional view illustrating a second embodiment of a marine reduction and reverse gear unit according to the present invention. -
FIG. 9 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit ofFIG. 8 . -
FIG. 10 is a longitudinal sectional view schematically illustrating a third embodiment of a marine reduction and reverse gear unit according to the present invention. -
FIG. 11 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit ofFIG. 10 . -
FIG. 12 is a sectional view taken along the line XII-XII ofFIG. 11 . -
FIG. 13 is a longitudinal sectional view schematically illustrating a fourth embodiment of a marine reduction and reverse gear unit according to the present invention. -
FIG. 14 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit ofFIG. 13 . -
FIG. 15 is a sectional view taken along the line XII-XII ofFIG. 14 . - Embodiments of marine reduction and reverse gear units according to the present invention are described below with reference to the attached drawings. In all of the drawings, the same reference numerals denote the same constitutional elements.
- First, a first embodiment of a marine reduction and reverse gear unit according to the present invention is described with reference to
FIGS. 1 to 4 .FIG. 1 is a longitudinal sectional view illustrating the marine reduction and reverse gear unit.FIG. 2 is a front view illustrating the engagement of gears of the marine reduction and reverse gear unit.FIG. 3 is a sectional view taken along the line III-III ofFIG. 2 .FIG. 4 is a diagram of a hydraulic circuit provided in the marine reduction and reverse gear unit. - The marine reduction and
reverse gear unit 1 is provided with acasing 2. Thecasing 2 is fixed on ahousing 5 in which components such as aflywheel 4 connected to arotary shaft 3 of an engine E (FIG. 4 ) are accommodated. Theflywheel 4 is connected to one end of aninput shaft 7 via anelastic coupling 6. Theinput shaft 7 is rotatably supported bybearings casing 2. Acover 5A of thehousing 5 may be integrally formed with thecasing 2. - A
drive gear 15 is fixed on theinput shaft 7, and areverse gear 16 is rotatably supported by theinput shaft 7. A reversehydraulic clutch 17 for connecting thedrive gear 15 andreverse gear 16 is also disposed on theinput shaft 7 and located between thedrive gear 15 andreverse gear 16. The reversehydraulic clutch 17 is a known wet multiplate clutch. A plurality of clutch discs are fixed on an inner drum integrally formed with thereverse gear 16, and each of a plurality of pressure plates fixed on an outer drum integrally formed with thedrive gear 15 are inserted into each space between the plurality of the clutch discs. These discs and plates are brought into tight contact with each other by the pressing force of a hydraulic piston to thereby transmit driving force. - The
reverse gear 16 is engaged with a firstidle gear 21 fixed on anidle shaft 20. Theidle shaft 20 is rotatably supported by acasing 2. A secondidle gear 22 is also fixed on theidle shaft 20 and located at a distance from the firstidle gear 21 toward the bow of the boat. The secondidle gear 22 is engaged with anoutput gear 26 fixed on anoutput shaft 25. A propeller P (FIG. 4 ) is fixed on theoutput shaft 25. The secondidle gear 22 and theoutput gear 26 are in the form of bevel gears. Theoutput shaft 25 is disposed at an acute angle with respect to theidle shaft 20, and theidle shaft 20 is disposed parallel to theinput shaft 7. Thus, the axial direction of theoutput shaft 25 is at an acute angle with respect to that of theinput shaft 7. - A first driven
gear 30 and a second drivengear 31 are disposed on the right and left sides of thedrive gear 15 in such a manner that thedrive gear 15 is sandwiched between the first and second driven gears 30, 31. The first drivengear 30 and the second drivengear 31 are engaged with thedrive gear 15. - The first driven
gear 30 is fixed on afirst support shaft 35. Thefirst support shaft 35 is rotatably supported by thecasing 2 and disposed parallel to theinput shaft 7. A firstforward speed gear 33 engaged with a firstidle gear 21 is rotatably supported by thefirst support shaft 35 and disposed at a distance from the first drivengear 30. A first forward speedhydraulic clutch 37 for connecting the first drivengear 30 and firstforward speed gear 33 is also disposed on thefirst support shaft 35 and located between the first drivengear 30 and the firstforward speed gear 33. The first forward speedhydraulic clutch 37 is a wet multiplate clutch as used for the reverse hydraulic clutch 17. - The second driven
gear 31 is fixed on asecond support shaft 32. Thesecond support shaft 32 is rotatably supported by thecasing 2 and disposed parallel to theinput shaft 7. A secondforward speed gear 36 engaged with a firstidle gear 21 is rotatably supported by thesecond support shaft 32 and disposed at a distance from the second drivengear 31. A second forward speedhydraulic clutch 34 for connecting the second drivengear 31 and secondforward speed gear 36 is also disposed on thesecond support shaft 32 and located between the second drivengear 31 and the secondforward speed gear 36. The second forward speedhydraulic clutch 34 is a wet multiplate clutch as used for the reverse hydraulic clutch 17. - By making the diameter of the first
forward speed gear 33 smaller than that of the secondforward speed gear 36, the speed reducing ratio provided by the firstforward speed gear 33 and the firstidle gear 21 is made greater than that provided by the secondforward speed gear 36 and the firstidle gear 21. - The first and
second support shafts input shaft 7 via thedrive gear 15, and the first and second driven gears 30, 31, respectively. According to this embodiment, a gear pump 10 (FIG. 3 ) driven by theinput shaft 7 is provided at the other end of thesecond support shaft 32. A hydraulic circuit for supplying hydraulic or lubricating oil to hydraulic clutches, etc. by thegear pump 10 is formed in ahydraulic control block 11, and thehydraulic control block 11 is mounted on thecasing 2. - The marine reduction and
reverse gear 1 having the above configuration transmits driving force from an engine E (seeFIG. 4 ) to anoutput shaft 25 in the following manner. - In reverse drive, rotation of the
input shaft 7 is transmitted to theoutput shaft 25 via thedrive gear 15, reverse hydraulic clutch 17,reverse gear 16, firstidle gear 21, secondidle gear 22, andoutput gear 26. - By shifting from reverse drive to first forward speed drive, the reverse hydraulic clutch 17 is disengaged and the first forward speed
hydraulic clutch 37 is engaged, so that the rotation of theinput shaft 7 is transmitted to theoutput shaft 25 via thedrive gear 15, first drivengear 30, firstforward speed gear 33, firstidle gear 21, secondidle gear 22, andoutput gear 26 to achieve a high reduction ratio. - By shifting from first forward speed drive to second forward speed drive, the first forward speed
hydraulic clutch 37 is disengaged and the second forward speedhydraulic clutch 34 is engaged, so that the rotation of theinput shaft 7 is transmitted to theoutput shaft 25 via thedrive gear 15, second drivengear 31, secondforward speed gear 36, firstidle gear 21, secondidle gear 22, andoutput gear 26 to achieve a low reduction ratio, compared with a high reduction ratio achieved with the first forward speed drive. - A first embodiment of a hydraulic circuit for controlling the reverse hydraulic clutch 17, first forward speed hydraulic clutch 37, and second forward speed
hydraulic clutch 34 is described below with reference toFIG. 4 . - A
gear pump 10 on asecond support shaft 32 is driven by rotation of aninput shaft 7. Thegear pump 10 draws oil from anoil sump 40 in thecasing 2 via anoil filter 41, and discharges the oil. The hydraulic oil discharged from thegear pump 10 is supplied to the reverse hydraulic clutch 17 via a forward/reversedirectional control valve 42 or supplied to the first forward speed hydraulic clutch 37 or second forward speedhydraulic clutch 34 via a forward/reversedirectional control valve 42 and an electromagneticshift control valve 46. - In the embodiment illustrated, the forward/reverse
directional control valve 42 is a manual 5-port, 3-position directional control valve. The forward/reversedirectional control valve 42 can be connected to ashift lever 42 a in the vessel by a wire cable (not shown). - The hydraulic circuit is provided with a
relief valve 47 having a soft engagement function to reduce the impact of abrupt engagement byclutches relief valve 47 comprises a pressure-control spring 48 and aspring bearing 49 in the form of a hydraulic piston, which is capable of compressing the pressure-control spring 48 and disposed in a cylinder (not shown). The hydraulic circuit includes a pressure control circuit formed by connecting a throttling passage branched from a forward output port and a reverse output port of the forward/reversedirectional control valve 42 to an oil chamber in thespring bearing 49. When the forward/reversedirectional control valve 42 is in the neutral position (as inFIG. 4 ), thespring bearing 49 is in the most retracted position due to a biasing force of the pressure-control spring 48, so that therelief valve 47 functions as a relief valve having a low set pressure. When the forward/reversedirectional control valve 42 is shifted to forward or reverse, thespring bearing 49 moves to compress the pressure-control spring 48 with a time delay. When the set pressure of therelief valve 47 gradually increases and thespring bearing 49 reaches a specified stroke, the maximum hydraulic pressure for the clutch is obtained. Thus, the hydraulic pressure for the clutch is gradually increased. - The oil passed through the
relief valve 47 is cooled with anoil cooler 50, and then passed through alubricant oil passage 51. The set pressure of thelubricant oil passage 51 is controlled by arelief valve 52. - According to the first embodiment of the hydraulic circuit, the boat is run at a normal speed by shifting the forward/
reverse switching valve 42 to the forward or reverse position. During normal-speed running, the electromagneticshift control valve 46 is not excited and is positioned as shown inFIG. 4 to thereby engage the second speedhydraulic clutch 34.Switch 42 b connected to the electromagneticshift control valve 46 is provided on the grip head of theshift lever 42 a. By shifting ashift lever 42 a, based on electrical commands, second forward speed is switched to first forward speed. When wakeboarding, where the boat runs with added ballast water to increase the tare weight, the first forward speedhydraulic clutch 37 for high reduction ratios is engaged to increase the number of engine revolutions and make a high torque range available, thereby achieving a stable boat speed and enhanced acceleration performance. When not wakeboarding, where the boat runs at a normal speed, the electromagneticshift control valve 46 is shifted to disengage the first forward speedhydraulic clutch 37 and engage the second forward speed hydraulic clutch 34, thereby reducing the number of engine revolutions and achieving stable economical running. - Next, a second embodiment of a hydraulic circuit is described below with reference to
FIG. 5 . The second embodiment of the hydraulic circuit is structurally the same as the above first embodiment except that a pilot-operated spring-return directional control valve, which operates using the primary hydraulic pressure as pilot pressure, is used as thedirectional control valve 46 a in place of the electromagneticdirectional control valve 46. - The
shift control valve 46 a shown inFIG. 5 is a spring offset valve. When the valve is in the normal position, the valve allows the secondary port to communicate with anoil passage 53 for supplying hydraulic oil to the second forward speedhydraulic clutch 34 for low reduction ratios for normal-speed running, and allows anoil passage 52 for supplying hydraulic oil to the first forward speedhydraulic clutch 37 for high reduction ratios to communicate with a drain. - As the number of rotations of the
input shaft 7 increases by increasing the number of engine revolutions, the number of rotations of thegear pump 10 increases, thereby increasing the pilot pressure, i.e., the pressure of oil running through theprimary oil passage 56, and shifting thedirectional control valve 46 a to the right side ofFIG. 5 against the spring force of the offsetspring 55. As a result, theshift control valve 46 a allows theoil passage 52 for supplying hydraulic oil to the second forward speed hydraulic clutch 34 to communicate with a drain, and allows theoil passage 52 for supplying hydraulic oil to the first forward speed hydraulic clutch 37 to communicate with theprimary oil passage 56, thereby disengaging the second forward speedhydraulic clutch 34 and engaging the first forward speedhydraulic clutch 37. - Since the hydraulic circuit according to the second embodiment operates in the above-described manner, the following effects can be achieved. When wakeboarding, where the boat runs at a comparatively low speed with added ballast water to increase the tare weight, the number of engine revolutions is increased to automatically engage the first forward speed
hydraulic clutch 37 and make a high torque range available, thereby providing a stable boat speed and enhanced acceleration performance. When not wakeboarding, where the boat runs at a normal speed, the number of engine revolutions is reduced to automatically disengage the first forward speedhydraulic clutch 37 and engage the second forward speed hydraulic clutch 34, thereby achieving stable running. Thus the operator is free from the need to perform complicated clutch shift operations, and does not have to be conscious thereof when running the boat. - Next, a third embodiment of a hydraulic circuit is described with reference to
FIG. 6 . The third embodiment of the hydraulic circuit is a modification of the second embodiment of the hydraulic circuit. - The third embodiment of the hydraulic circuit is the same as the second embodiment in that the
shift control valve 46 b is a pilot-operated spring-return 3-position directional control valve using the primary pressure as pilot pressure. - However, the
shift control valve 46 b shown inFIG. 6 is structurally different from thevalve 46 a shown inFIG. 5 in that when the shift control valve is in the center position, the secondary port communicates with both of the oil passages to supply hydraulic oil to the first forward speedhydraulic clutch 37 and the second forward speedhydraulic clutch 34. - Other differences from the hydraulic circuit of
FIG. 5 are that thepilot oil passage 57 of theshift control valve 46 b is provided with avariable throttle valve 58, and thereturn spring 55 of theshift control valve 46 b is provided with a springforce adjustment mechanism 55 a. - According to the third embodiment of the hydraulic circuit having the above configuration, when the
shift control valve 46 b is in the center position at the time of shifting from forward first speed to second forward speed, hydraulic oil is temporarily supplied to both the first forward speedhydraulic clutch 37 and the second forward speedhydraulic clutch 34. As a result, there is no temporal decrease in the number of rotations of the output shaft as indicated by the broken line in the graph ofFIG. 7 when shifting from first forward speed to second forward speed, and smooth shifting as indicated by the solid line in the graph ofFIG. 7 is achieved partly due to the slip engagement effect of the friction clutch. - In the embodiment illustrated, the
pilot oil passage 57 is provided with avariable throttle valve 58, and thereturn spring 55 is provided with a springforce adjustment mechanism 55 a. However, since these components are to adjust the timing of shifting between first forward speed and second forward speed, either one of the components may be used. It is also possible to use a variable flow-control valve in place of thevariable throttle valve 58. - Next, a second embodiment of a marine reduction and reverse gear according to the present invention is described with reference to
FIGS. 8 and 9 . - As shown in
FIG. 8 , the marine reduction andreverse gear unit 1A according to the second embodiment comprises abevel gear 60 fixed on aninput shaft 7 a supported by acasing 2 a. Adrive gear 15 a engaged with thebevel gear 60 is fixed on athird support shaft 61. Thethird support shaft 61 is supported by thecasing 2 a and disposed at an acute angle with respect to the axis of theinput shaft 7 a. Areverse gear 16 a is rotatably supported by thethird support shaft 61 and disposed at a distance from thedrive gear 15 a toward the bow of the boat. A reverse hydraulic clutch 17 a for connecting thedrive gear 15 a andreverse gear 16 a is disposed between thedrive gear 15 a andreverse gear 16 a. Thereverse gear 16 a is engaged with anoutput gear 26 a of anoutput shaft 25 a. Theoutput shaft 25 a is rotatably supported by thecasing 2 a and disposed parallel to thethird support shaft 61. Thus, the direction of theoutput shaft 25 a is disposed at an acute angle with respect to theinput shaft 7 a. - A first driven
gear 30 a and a second drivengear 31 a are disposed on the right and left sides of the drivengear 15 a to sandwich the drivengear 15 a between the first and second driven gears 30 a, 31 a. The first drivengear 30 a and the second drivengear 31 a are engaged with thedrive gear 15 a. - The first driven
gear 30 a is fixed on afirst support shaft 35 a. Thefirst support shaft 35 a is rotatably supported by thecasing 2 a and disposed parallel to thethird support shaft 61. A forwardfirst gear 33 a engaged with anoutput gear 26 a is rotatably supported by thefirst support shaft 35 a and disposed at a distance from the first drivengear 30 a toward the bow of the boat. A first forward speed hydraulic clutch (not shown) for connecting the first drivengear 30 a and the firstforward speed gear 33 a is also disposed on thefirst support shaft 35 a and located between the first drivengear 30 a and the firstforward speed gear 33 a. - The second driven
gear 31 a is fixed on asecond support shaft 32 a. Thesecond support shaft 32 a is rotatably supported by thecasing 2 a and disposed parallel to thethird support shaft 61. A secondforward speed gear 36 a engaged with anoutput gear 26 a is rotatably supported by thesecond support shaft 32 a and disposed at a distance from the second drivengear 31 a. A second forward speed hydraulic clutch (not shown) for connecting the second drivengear 31 a and the secondforward speed gear 36 a is also disposed on thesecond support shaft 32 a and located between the second drivengear 31 a and the secondforward speed gear 36 a. - The input shaft of the marine reduction and reverse gear unit according to the second embodiment is shorter than the input shaft according to the first embodiment. This downsizing can provide more space above the
casing 2. The hydraulic circuit may be the same as in the first embodiment. - Next, a third embodiment of a marine reduction and reverse gear unit according to the present invention is described with reference to
FIGS. 10 to 12 . The first and second embodiments illustrate V-drive marine reduction and reverse gear units. The third embodiment illustrates an angle-drive marine reduction and reverse gear unit. - The third embodiment is a modification of the first embodiment to an angle-drive marine reduction and reverse gear unit in which the idle shaft is omitted from the first embodiment.
- In reverse drive, engine revolution is transmitted to an
output shaft 25 b via the following components: anelastic coupling 6; aninput shaft 7 b; adrive gear 15 b fixed on aninput shaft 7 b; a reverse hydraulic clutch 17 b; areverse gear 16 b rotatably supported by theinput shaft 7 b; and anoutput gear 26 b. - In first forward speed drive, engine revolution is transmitted to the
output shaft 25 b via the following components: theelastic coupling 6; theinput shaft 7 b; thedrive gear 15 b fixed on theinput shaft 7 b; a first drivengear 30 b fixed on afirst support shaft 35 b and engaged with the drivengear 15 b; a first forward speed hydraulic clutch 37 b; a firstforward speed gear 33 b; and theoutput gear 26 b. - In second forward speed drive, engine revolution is transmitted to the
output shaft 25 b via the following components: theelastic coupling 6; theinput shaft 7 b; thedrive gear 15 b fixed on theinput shaft 7 b; a second drivengear 31 b fixed on asecond support shaft 32 b and engaged with the drivengear 15 b; a second forward speed hydraulic clutch 34 b; a secondforward speed gear 36 b; and theoutput gear 26 b. - Next, a fourth embodiment of a marine reduction and reverse gear unit according to the present invention is described with reference to
FIGS. 13 to 15 . The fourth embodiment is a modification of the second embodiment to an angle-drive marine reduction and reverse gear unit in which adrive gear 15 c is not directly engaged with abevel gear 60 fixed on aninput shaft 7 c, but anothergear 62 mounted side-by-side with thedrive gear 15 c on athird support shaft 61 c is engaged with thebevel gear 60, so that rotation of theinput shaft 7 c is transmitted from thegear 62 to thedrive gear 15 c via thethird support shaft 61 c. More specifically, thegear 62 is integrally connected to thedrive gear 15 c. - In reverse drive, engine revolution is transmitted to an
output shaft 25 c via the following components: anelastic coupling 6; aninput shaft 7 c; abevel gear 60; agear 62; adrive gear 15 c; a reverse hydraulic clutch 17 c; areverse gear 16 c; and anoutput gear 26. - In first forward speed drive, engine revolution is transmitted to the
output shaft 25 c via the following components: theelastic coupling 6; theinput shaft 7 c; thebevel gear 60; thegear 62; thedrive gear 15 c; a first drivengear 30 c fixed on afirst support shaft 35 c; a first forward speed hydraulic clutch 37 c; a firstforward speed gear 33 c supported by thefirst support shaft 35 c; and theoutput gear 26 c. - In second forward speed drive, engine revolution is transmitted to the
output shaft 25 c via the following components: theelastic coupling 6; theinput shaft 7 c; thebevel gear 60; thegear 62; thedrive gear 15 c; a second drivengear 31 c fixed on asecond support shaft 32 c; a second forward speed hydraulic clutch 34 c; a secondforward speed gear 36 c supported by thesecond support shaft 32 c; and theoutput gear 26 c. - In the fourth embodiment, the
gear 62 may be omitted and thedrive gear 15 c may be engaged with thebevel gear 60 as in the second embodiment.
Claims (7)
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US20090139226A1 (en) * | 2007-12-04 | 2009-06-04 | Kazuyoshi Harada | Hydraulic control apparatus for marine reversing gear assembly for watercraft |
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ITPC20080032A1 (en) * | 2008-07-15 | 2010-01-16 | R T N S R L | BRAKING SYSTEM FOR TRANSMISSIONS OF MARINE ENGINES AND TRANSMISSION PROVIDED WITH THIS BRAKING SYSTEM |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3695401A (en) * | 1968-07-22 | 1972-10-03 | Yanmar Diesel Engine Co | Reverse and reduction gear for ships |
US3922997A (en) * | 1974-04-17 | 1975-12-02 | Gardner Denver Co | Marine power transmission system |
US4383829A (en) * | 1979-10-25 | 1983-05-17 | Great Lakes Power Products, Inc. | Drive assembly for inboard speedboat |
US4568289A (en) * | 1978-08-24 | 1986-02-04 | Bhs-Bayerische Berg-, Hutten-Und Salzwerke | Marine transmission gear unit with double drive |
US4735104A (en) * | 1985-06-12 | 1988-04-05 | M.P.M. Meccanica Padana Monteverde S.P.A. | Drive transmission unit for equal forward and reverse speeds, in particular for a ship drive |
US6443286B1 (en) * | 2001-01-18 | 2002-09-03 | Twin Disc, Incorporated | Modulatable power transmission clutch and a marine transmission |
US6761600B2 (en) * | 2000-03-27 | 2004-07-13 | Reintjes Gmbh | Marine gear and a method for preventing a drop in motor speed when engaging a multi-plate clutch |
US20060157316A1 (en) * | 2005-01-18 | 2006-07-20 | Kanzaki Kokyukoki Mfg. Co., Ltd. | Marine reversing gear assembly provided with locking device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0665904B2 (en) | 1986-04-11 | 1994-08-24 | ヤンマーディーゼル株式会社 | Marine deceleration reversing machine |
US5305729A (en) | 1992-02-14 | 1994-04-26 | Chiuminatta Edward R | Method and apparatus for cutting wet concrete |
JP2596979Y2 (en) | 1992-10-28 | 1999-06-28 | 豊田合成株式会社 | Clamp |
JP2006117160A (en) | 2004-10-22 | 2006-05-11 | Kanzaki Kokyukoki Mfg Co Ltd | Speed reduction reverser for vessel |
-
2007
- 2007-07-24 US US11/878,322 patent/US8157070B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3695401A (en) * | 1968-07-22 | 1972-10-03 | Yanmar Diesel Engine Co | Reverse and reduction gear for ships |
US3922997A (en) * | 1974-04-17 | 1975-12-02 | Gardner Denver Co | Marine power transmission system |
US4568289A (en) * | 1978-08-24 | 1986-02-04 | Bhs-Bayerische Berg-, Hutten-Und Salzwerke | Marine transmission gear unit with double drive |
US4383829A (en) * | 1979-10-25 | 1983-05-17 | Great Lakes Power Products, Inc. | Drive assembly for inboard speedboat |
US4735104A (en) * | 1985-06-12 | 1988-04-05 | M.P.M. Meccanica Padana Monteverde S.P.A. | Drive transmission unit for equal forward and reverse speeds, in particular for a ship drive |
US6761600B2 (en) * | 2000-03-27 | 2004-07-13 | Reintjes Gmbh | Marine gear and a method for preventing a drop in motor speed when engaging a multi-plate clutch |
US6443286B1 (en) * | 2001-01-18 | 2002-09-03 | Twin Disc, Incorporated | Modulatable power transmission clutch and a marine transmission |
US20060157316A1 (en) * | 2005-01-18 | 2006-07-20 | Kanzaki Kokyukoki Mfg. Co., Ltd. | Marine reversing gear assembly provided with locking device |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090139226A1 (en) * | 2007-12-04 | 2009-06-04 | Kazuyoshi Harada | Hydraulic control apparatus for marine reversing gear assembly for watercraft |
US8146723B2 (en) * | 2007-12-04 | 2012-04-03 | Yanmar Co., Ltd. | Hydraulic control apparatus for marine reversing gear assembly for watercraft |
EP2108583A1 (en) | 2008-04-10 | 2009-10-14 | Reintjes GmbH | Ship gear with reversing drive |
DE102008018703A1 (en) * | 2008-04-10 | 2009-10-15 | Reintjes Gmbh | Marine gear |
US20090280701A1 (en) * | 2008-04-10 | 2009-11-12 | Reintjes Gmbh | Marine-vessel transmission |
ITPC20080032A1 (en) * | 2008-07-15 | 2010-01-16 | R T N S R L | BRAKING SYSTEM FOR TRANSMISSIONS OF MARINE ENGINES AND TRANSMISSION PROVIDED WITH THIS BRAKING SYSTEM |
US11535347B2 (en) | 2012-07-06 | 2022-12-27 | Skier's Choice, Inc. | Wakeboat hull control systems and methods |
US10759507B2 (en) | 2012-07-06 | 2020-09-01 | Skier's Choice, Inc. | Wakeboat hull control systems and methods |
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US10829186B2 (en) | 2016-09-09 | 2020-11-10 | Richard L. Hartman | Wakeboat ballast measurement assemblies and methods |
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US10611439B2 (en) | 2016-09-09 | 2020-04-07 | Richard L. Hartman | Wakeboat engine hydraulic pump mounting apparatus and methods |
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US10435122B2 (en) | 2016-09-09 | 2019-10-08 | Richard L. Hartman | Wakeboat propulsion apparatuses and methods |
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US11492081B2 (en) | 2016-09-09 | 2022-11-08 | Richard L. Hartman | Aquatic invasive species control apparatuses and methods for watercraft |
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